"How am I supposed to feel? This is just ridiculous. I'm banging my head against a brick wall," Ms Johnston said.

Opposition leader Mark McGowan told reporters on Sunday Ms Johnston was in tears when he spoke to her.

"She's of the view, and I agree with her, that Mr Ugle shouldn't have been released and that his conduct has shown that he shouldn't be outside of prison at this point in time," he said.

Under legislative changes introduced to parliament this month, the review of a dangerous sex offender's status would occur every two years instead of annually and their release would be delayed by at least three weeks to allow the community to be notified and supervision arrangements made.

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Victims will also be able to make a submission to the court about conditions for their protection being included in a supervision order and the court could restrict public comment from dangerous sex offenders about their victims.

But Mr McGowan said Ugle's case showed the proposed changes were "cosmetic" and would not fix the problem.

"My view is, if you're a serious risk of reoffending and the court finds that, you should remain behind bars," he said.